A receptacle for terminating an optical fiber at an active device such as a photodetector or solid-state light source. The receptacle includes a housing, a termination fixture and an active device. The housing has an opening for receiving the terminal portion of an optical fiber, a door located at the opening, biased to a closed position and having a latch for releasably receiving an optical fiber plug, and a removable plate allowing access to an interior of the housing. The termination fixture and the active device may be mounted to a common substrate attached to an interior portion of the housing. The termination fixture includes a base and a projection attached to the base proximate a light-transmitting portion thereof, the projection having a fiber-receiving groove directed toward a fiber stop surface located on the light-transmitting portion of the base. The base can have a lens integrally molded with the light-transmitting portion. The active device is positioned with respect to the termination fixture to receive light from, and/or transmit light to, any fiber whose terminal portion is located in the V-groove and abutting the fiber stop. An optional optical plate may be used to adjust the optical characteristics of the termination fixture.